Port Authority Down Jacket. J323 100% Nylon For lofty, protective warmth you just can't beat genuine down. Our Down Jacket is a superb weather-fighter on its own--or it can be zipped into the Heavyweight Parka (J799 and J799S, sold separately) for double the protection. 100% nylon shell 600 fill power down insulation Elastic binding at cuffs and hem Open pockets